Method and system for processing acoustic signals

Details Method and system for processing acoustic signals Method and system for processing acoustic signals

1997-07-09

1998-11-24

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

By combining or comparing signals

367131, G01S 380, H04B 1100

Patent

active

058417354

ABSTRACT:
A method for processing acoustic signals received by first and second undater detectors, spaced from each other, for detection and determination of range and bearing of an underwater signal source, includes the steps of obtaining a time series xd of first random variables X from the first detector, obtaining a time series yd of second random variables Y from the second detector, and providing a window of a selected number of digital points of time series xd and yd. The method further includes determining distribution of p(x,y), p(x), and p(y), wherein p(x,y)=joint distribution, p(x)=distribution of x, and p(y)=distribution of y, and estimating mutual information I(X;Y) of the random variables X,Y whereby to obtain a measure of dependence between the random variables X and Y in the window, whereby to determine whether xd and yd come from a single source, and if xd and yd are determined to have come from the same source, computing time differential in receipt of the X and Y signals by the first and second spaced detectors to provide the range and bearing of the source from the first and second detectors. The invention further relates to a system for performing the steps of the above method.

REFERENCES:
patent: 5668778 (1997-09-01), Quazi

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